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Letter Sequences
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Author:  GravyTrain [ Sat Oct 22, 2005 9:11 pm ]
Post subject:  Letter Sequences

ABCDEFGHIJKLMNOPQRSTUVWXYZ

There are three types of letter sequencing that can all be worked out in the same way.

1.

AB BC CD DE EF FG ??

Working with a simple example.

Children who have difficulty with this sequence try to make an association between AB and BC and CD etc.

However, the key is to realise that there is no association between the individual pairs of letters.

The solution comes from:

First letter sequence

A B C D E F G

and the second letter sequence

B C D E F G H

If you consider this sequence

AT DQ GN JK MH

There appears to be no logical solution until you split the sequence

First letter sequence

A D G J M

The sequence is moving forward three letters each time, so the next letter is 'P'

Second letter sequence

T Q N K H

The sequence is moving back three letters each time, so the next letter is 'E'

So the solution is obtained by moving forwards or backwards along the alphabet.

But, what happens if the sequence is at 'Y' and you want to move forward four places, or the sequence is at 'B' and you want to move back four places.

In these situations you need to consider that the alphabet repeats itself after 'Z' and reverses before 'A' e.g

XYZ ABCDE.................................WXYZ ABCD

So 'Y' forward four is 'C'
and
'B' back four is 'X'

2.

DH is to KN
as
CD is to ??

Again look at first letter, second letter pattern.

First letters
'D' to 'K' is forward seven

Second letters
'H' to 'N' is forward six

Use this information to solve the question
'C' forward seven is 'J'

'D' forward six is 'J'

The answer is JJ

3.
The code for VERBAL is XGTDCN
what is the code for TUTORS?

'V' to 'X' is forward two
'E' to 'G' is forward two
'R' to 'T' is forward two
'B' to 'D' is forward two
'A' to 'C' is forward two
'L' to 'N' is forward two

The code for TUTORS is worked out in the same way

T = V
U = W
T = V
O = Q
R = T
S = U

If anyone finds this information useful and would like to post requests for any more notes, then feel free to do so, but please don't post messages that may "bung-up" this link.

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